The structure that helps in the formation of cilia and flagella is

Answer Details

Cilia and flagella are hair-like projections from the cell surface that are involved in locomotion (in unicellular organisms and sperm cells) or in moving substances across cell surfaces (such as mucus in the respiratory tract). Their formation depends on a specific organelle: the centriole.

Centrioles are cylindrical structures made of microtubules arranged in a characteristic 9+0 pattern (nine triplets of microtubules with no central pair). They are found in the centrosome of animal cells. During the formation of cilia and flagella, a centriole migrates to the cell surface and becomes the basal body, which serves as the organising centre from which the microtubules of the cilium or flagellum grow outward. The internal structure of cilia and flagella (the axoneme) has a 9+2 arrangement of microtubules, templated by the basal body.

The other options serve different functions:

• Plastids are organelles found in plant cells (e.g., chloroplasts for photosynthesis); they play no role in cilia or flagella formation.
• Golgi bodies (Golgi apparatus) are involved in modifying, packaging, and transporting proteins and lipids.
• Lysosomes contain hydrolytic enzymes for intracellular digestion and recycling of cellular components.